A U-bolt is a bolt in the shape of the letter U with screw threads on both ends&period;U-bolts have primarily been used to support pipework&comma; pipes which fluids and gasses pass through&period; As such&comma; U-bolts were measured using pipe work engineering speak&period; A U-bolt would be described by the size of pipe it was supporting&period;For example&comma; a 40 Nominal Bore U-bolt would be asked for by pipe work engineers&comma; and only they would know what that meant&period; In reality&comma; the 40 nominal bore part bears little resemblance to the size and dimensions of the u-bolt&period;The nominal bore of a pipe is actually a measurement of the inside diameter of the pipe&period; Engineers are interested in this because they design a pipe by the amount of fluid &sol; gas it can transport&period;As U-bolts are now being used by a much wider audience to clamp any kind of tubing &sol; round bar then a more convenient measurement system needs to be used&period;

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